CN216312989U - Novel UPS bypass pressure regulating device - Google Patents
Novel UPS bypass pressure regulating device Download PDFInfo
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- CN216312989U CN216312989U CN202122009821.XU CN202122009821U CN216312989U CN 216312989 U CN216312989 U CN 216312989U CN 202122009821 U CN202122009821 U CN 202122009821U CN 216312989 U CN216312989 U CN 216312989U
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Abstract
The utility model discloses a novel UPS bypass voltage regulating device. The automatic bypass voltage regulating device is formed by combining the automatic protection device, the bypass switch is connected and controlled to start and stop the operation of the bypass voltage regulating device, the isolation transformer is arranged and connected between an input winding and an output winding, and a current transformer and a linkage regulating switch are arranged at the output end of the bypass voltage regulating device. The gain effect of the utility model is: the bypass voltage regulating device can automatically keep the stability of output voltage and the stable voltage regulation, and can ensure the reliable and stable power supply. The utility model has the advantages of large accessible load capacity, wide voltage regulation range, low energy loss, high output voltage amplitude precision, high voltage regulation response speed, no waveform distortion and the like.
Description
Technical Field
The utility model relates to the technical field of UPS (uninterrupted power supply) matching devices, in particular to a novel UPS bypass voltage regulating device.
Background
A UPS (universal Power System/universal Power Supply), i.e., an ac Uninterruptible Power Supply, is a System device that connects a battery (mostly a lead-acid maintenance-free battery) with a host, and converts direct current into commercial Power through a module circuit such as a host inverter. The power supply device is mainly used for providing stable and uninterrupted power supply for a single computer, a computer network system or other power electronic equipment such as an electromagnetic valve, a pressure transmitter and the like. When the commercial power input is normal, the UPS supplies the commercial power to the load for use after stabilizing the voltage, and the UPS is an alternating current type voltage stabilizer and also charges the battery in the machine; when the commercial power is interrupted (power failure in accident), the UPS immediately supplies the direct current electric energy of the battery to the load by a method of switching and converting the inverter to continuously supply 220V alternating current to the load, so that the load keeps normal work and the software and hardware of the load are protected from being damaged. UPS devices typically provide protection against either excessive voltage or insufficient voltage.
However, the conventional ac Uninterruptible Power Supply (UPS) has no bypass device with an automatic voltage regulation function in cooperation with the UPS during installation and use. When the voltage of an external power supply grid fluctuates or the load changes, the fluctuation range of the output voltage of the UPS is large, the stability is insufficient, and the power supply quality cannot be effectively guaranteed.
In view of this, a technical solution that can be accessed quickly and regulate the UPS system in real time to improve the working stability of the existing UPS system is needed.
Disclosure of Invention
The utility model aims to solve the defects of the conventional alternating current Uninterruptible Power Supply (UPS) in use, and provides a novel UPS bypass voltage regulating device which can automatically keep the output voltage stable and the voltage regulation stable and can ensure the power supply to be reliable and stable.
In order to solve the technical problems, the utility model adopts the technical scheme that:
a novel UPS bypass voltage regulating device comprises a step-up transformer, a step-down transformer, an isolation transformer, a bypass switch, an automatic protection device, a silicon controlled rectifier regulating device, a measurement checking device and a linkage regulating switch, the step-down transformer is arranged at the input end of the device and has the functions of voltage reduction and regulation, when the amplitude and polarity of the voltage applied to the primary coil of the input end are changed in an amplification way, the secondary coil of the transformer can generate corresponding amplitude and polarity adjustment, the step-up transformer is arranged at the output end of the device and has the functions of step-up and voltage regulation, when the amplitude and the polarity of the voltage applied to the primary coil of the input end are reduced, the secondary coil of the transformer can generate corresponding amplitude and polarity adjustment, and the winding adjusting end of the step-down transformer and the winding adjusting end of the step-up transformer are connected with the adjusting part of the linkage adjusting switch.
The linkage adjusting switch is responsible for linkage control and adjustment of the position of a winding of the step-down transformer and the position of a winding access device of the step-up transformer, and the silicon controlled rectifier adjusting device can work under the conditions of high voltage and large current and has the advantages of high voltage resistance, large capacity, small size, high response speed and the like.
The silicon controlled rectifier adjusting device comprises a first silicon controlled rectifier, a second silicon controlled rectifier, a third silicon controlled rectifier, a fourth silicon controlled rectifier and a fifth silicon controlled rectifier, wherein the first silicon controlled rectifier, the second silicon controlled rectifier, the third silicon controlled rectifier and the fourth silicon controlled rectifier are connected in series, the first silicon controlled rectifier and a winding adjusting end of the step-down transformer are arranged in parallel, the third silicon controlled rectifier and a winding adjusting end of the step-up transformer are arranged in parallel, and the fifth silicon controlled rectifier and the first silicon controlled rectifier, the second silicon controlled rectifier, the third silicon controlled rectifier and a passage formed by the fourth silicon controlled rectifier are arranged in series.
The measurement and inspection device comprises a protection measurement and inspection part, a first winding measurement and inspection part and a second winding measurement and inspection part, wherein the protection measurement and inspection part is connected in series with the front end of a fifth silicon controlled rectifier, the fifth silicon controlled rectifier and the protection measurement and inspection part are connected with a zero line of the device, the first winding measurement and inspection part is connected with the first silicon controlled rectifier in parallel, the first winding measurement and inspection part is used for inspecting whether the winding position of the step-down transformer is in the correct position, the second winding measurement and inspection part is connected with the third silicon controlled rectifier in parallel, and the second winding measurement and inspection part is used for inspecting whether the winding position of the step-up transformer is in the correct position.
Automatic protection device sets up the fifth silicon controlled rectifier with between the inspection portion is measured in the protection, whether the protection that inspection portion is used for detecting automatic protection device normally operates is measured in the protection, bypass switch sets up between input live wire and the output live wire, bypass switch is connected with bypass regulator output, bypass switch is responsible for the start-up and the withdraw from of control bypass regulator.
The isolation transformer is arranged to be connected between the windings of the step-down transformer and the step-up transformer for electrically isolating the input winding and the output winding from each other to avoid the risk of accidentally touching both the live body (or the metal part that may be live due to insulation damage) and the ground.
Preferably, automatic safety device includes MCU control circuit, overvoltage and undervoltage detection device, frequency anomaly detection device, machine fault detection alarm device, MCU control circuit is used for realizing the pressure regulating control function, overvoltage and undervoltage detection device is used for the detection voltage size to judge whether need be adjusted, frequency anomaly detection device is used for detecting whether voltage frequency is normal, machine fault detection alarm device is used for carrying out sound after discovering machine and device trouble, light, modes such as communication report to the police, detection interconnection through each protection device, bypass pressure regulating device's security has been improved greatly, ensure that bypass pressure regulating device can satisfy the demand of long-term continuous operation.
Preferably, a current transformer is arranged at the output end of the bypass voltage regulating device, the current transformer is arranged between the rear end of the boosting transformer and the linkage regulating switch, and the current transformer converts the circulating large current into small current to prevent the circuit board from being damaged.
Preferably, bypass switch closes gear and automatic voltage regulation gear including the pressure regulating, lets bypass regulator can insert and break off at any time according to actual production, carries out automatic voltage regulation fast and handles, guarantees voltage output control's flexibility.
Preferably, a power input control switch is arranged at the input end, and the working state of the bypass voltage regulating device is rapidly controlled through the power input control switch.
Preferably, novel UPS bypass regulator connects display device and communication device, can transmit the operating condition of exchanging uninterrupted power source device (UPS), bypass regulator's running state and the trouble problem that meets for operating personnel fast directly perceivedly, and operating personnel can in time make corresponding processing reaction to improve exchanging uninterrupted power source device (UPS)'s job stabilization nature.
Preferably, the novel UPS bypass voltage regulation device comprises four voltage regulation gears, wherein the voltage regulation gears comprise a large voltage boosting gear, a small voltage boosting gear, a voltage reduction gear and a direct gear.
Preferably, when the step-up gear is small, the winding length of the winding access device end of the step-up transformer is longer than that of the winding access device end of the step-down transformer.
Compared with the prior art, the utility model has the following gain effects:
the bypass voltage regulating device can automatically keep the stability of output voltage and the stable voltage regulation, and can ensure the reliable and stable power supply. When the voltage of an external power supply grid fluctuates or the load changes, the voltage regulating device can automatically and quickly regulate the output voltage and keep the voltage output stable.
The bypass voltage regulating device can bear instantaneous overload, is suitable for various linear and nonlinear loads, and has wide application range; the bypass pressure regulating device is provided with a manual and automatic random switching control mode, and can effectively meet the long-term continuous working requirement of the device by combining automatic protection devices such as overvoltage, undervoltage, frequency abnormality, machine faults and the like.
The bypass voltage regulating device has the advantages of large accessible load capacity, wide voltage regulation range, low energy loss, high output voltage amplitude precision, high voltage regulation response speed, no waveform distortion and the like.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic diagram of a large step-up gear according to the present invention.
Fig. 3 is a schematic diagram of a small step-up gear of the present invention.
FIG. 4 is a schematic view of the step down shift of the present invention.
FIG. 5 is a through gear schematic of the present invention.
The reference numerals are explained below:
the device comprises a step-up transformer-1, a step-down transformer-2, a bypass switch-3, an automatic protection device-4, a first silicon controlled rectifier-5, a second silicon controlled rectifier-6, a third silicon controlled rectifier-7, a fourth silicon controlled rectifier-8, a fifth silicon controlled rectifier-9, a protection measurement inspection part-10, a first winding measurement inspection part-11, a second winding measurement inspection part-12, a current transformer-13, a linkage adjusting switch-14, a power input control switch-15 and an adjusting part-16.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
To further clarify the objects, features and functions of the present invention, a review board will be provided by referring to the following description of the preferred embodiments in conjunction with the accompanying drawings:
referring to fig. 1-5, the utility model is a novel UPS bypass voltage regulator, including a step-up transformer 1, a step-down transformer 2, an isolation transformer, a bypass switch 3, an automatic protection device 4, a thyristor regulator, a measurement and inspection device, and a linkage regulating switch 14.
Step-down transformer 2 sets up at the device input, step-down transformer 2 plays step-down voltage regulation function, and when the size and the polarity of the voltage that adds on the input primary coil took place the amplitude change, the secondary coil that enables the transformer produced corresponding amplitude and polarity and adjusts, step-up transformer 1 sets up at the device output, step-up transformer 1 plays the voltage regulation function that steps up, and when the size and the polarity of the voltage that add on the input primary coil took place the amplitude change, the secondary coil that enables the transformer produced corresponding amplitude and polarity and adjusts, step-down transformer 2's winding regulation end with step-up transformer 1's winding regulation end is connected with linkage regulating switch 14's regulating part 16.
The linkage adjusting switch 14 is responsible for linkage control and adjustment of the positions of the winding of the step-down transformer 2 and the winding access device of the step-up transformer 1, and the silicon controlled rectifier adjusting device can work under the conditions of high voltage and large current and has the advantages of high withstand voltage, large capacity, small volume, high response speed and the like.
The silicon controlled rectifier adjusting device comprises a first silicon controlled rectifier 5, a second silicon controlled rectifier 6, a third silicon controlled rectifier 7, a fourth silicon controlled rectifier 8 and a fifth silicon controlled rectifier 9, wherein the first silicon controlled rectifier 5, the second silicon controlled rectifier 6, the third silicon controlled rectifier 7 and the fourth silicon controlled rectifier 8 are connected in series, the first silicon controlled rectifier 5 is connected with a winding adjusting end of the step-down transformer 2 in parallel, the third silicon controlled rectifier 7 is connected with a winding adjusting end of the step-up transformer 1 in parallel, and the fifth silicon controlled rectifier 9 is connected with the first silicon controlled rectifier 5, the second silicon controlled rectifier 6, the third silicon controlled rectifier 7 and a passage formed by the fourth silicon controlled rectifier 8 in series.
The measurement and inspection device comprises a protection measurement and inspection part 10, a first winding measurement and inspection part 11 and a second winding measurement and inspection part 12, wherein the protection measurement and inspection part 10 is arranged at the front end of a fifth silicon controlled rectifier 9 in series, the fifth silicon controlled rectifier 9 and the protection measurement and inspection part 10 are connected with a zero line of the device, the first winding measurement and inspection part 11 is arranged in parallel with the first silicon controlled rectifier 5, the first winding measurement and inspection part 11 is used for inspecting whether the winding position of the step-down transformer 2 is in the correct position, the second winding measurement and inspection part 12 is arranged in parallel with the third silicon controlled rectifier 7, and the second winding measurement and inspection part 12 is used for inspecting whether the winding position of the step-up transformer 1 is in the correct position.
The automatic protection device 4 is arranged between the fifth controllable silicon 9 and the protection measurement checking part 10, the protection measurement checking part 10 is used for detecting whether the protection function of the automatic protection device 4 normally operates, and the bypass switch 3 is arranged between an input live wire and an output live wire.
Preferably, automatic protection device 4 includes MCU control circuit, overvoltage and undervoltage detection device, frequency anomaly detection device, machine fault detection alarm device, MCU control circuit is used for realizing the pressure regulating control function, overvoltage and undervoltage detection device is used for the detection voltage size to judge whether need be adjusted, frequency anomaly detection device is used for detecting whether voltage frequency is normal, machine fault detection alarm device is used for carrying out sound after discovering machine and device trouble, light, modes such as communication report to the police, detection interconnection through each protection device, bypass regulator's security has been improved greatly, ensure that bypass regulator can satisfy the demand of long-term continuous operation.
Preferably, a current transformer 13 is arranged at the output end of the bypass voltage regulator, the current transformer 13 is arranged between the rear end of the step-up transformer 1 and the linkage regulating switch 14, and the current transformer converts the circulating large current into small current to prevent the circuit board from being damaged.
Preferably, bypass switch 3 closes gear and automatic voltage regulation gear including the pressure regulating, lets bypass regulator can insert and break off at any time according to actual production, carries out automatic voltage regulation fast and handles, guarantees voltage output control's flexibility.
Preferably, a power input control switch 15 is arranged at the input end, and the working state of the bypass voltage regulating device is rapidly controlled through the power input control switch 15.
Preferably, novel UPS bypass regulator connects demonstration and communication device, can transmit the operating condition of exchanging uninterrupted power source device (UPS), bypass regulator's running state and the trouble problem that meets directly perceivedly fast for operating personnel, and operating personnel can in time make corresponding processing reaction to improve the job stabilization nature of exchanging uninterrupted power source device (UPS).
Preferably, novel UPS bypass regulator includes four pressure regulating gears, the pressure regulating gear is including big step-up gear, little step-up gear, step-down gear and direct gear, and the device is carried out real-time gear according to the voltage variation information who obtains and is adjusted by MCU control circuit.
Further, when the voltage is in the small step-up gear, the winding length of the winding access device end of the step-up transformer 1 is longer than that of the winding access device end of the step-down transformer 2.
Example 1:
when the device detects that the input voltage of the AC uninterrupted power supply device becomes low and the input voltage is 180V-210V, the novel UPS bypass voltage regulating device automatically regulates to a large boosting gear, as shown in figure 2, the linkage regulating switch 14 acts, the linkage regulating switch 14 regulates the winding of the step-down transformer 2 to the highest position through the regulating part 16, the winding of the step-up transformer 1 to the lowest position is regulated, meanwhile, the first silicon controlled rectifier 5, the second silicon controlled rectifier 6 and the fourth silicon controlled rectifier 8 are closed, the third silicon controlled rectifier 7 is disconnected, so that the step-down transformer 2 does not act, the step-up transformer 1 acts, and the AC uninterrupted power supply device can stably boost the power supply voltage by 220V and convey the power supply voltage to a load for normal work through the bypass voltage regulating device.
An isolation transformer is arranged connected between the windings of the step-down transformer 2 and the windings of the step-up transformer 1 for electrically isolating the windings of the step-down transformer 2 and the windings of the step-up transformer 1 from each other to avoid the danger of accidentally touching live objects or metal parts and ground that may be live due to insulation damage at the same time.
Example 2:
when the device detects that the input voltage of the AC uninterrupted power supply device is slightly lowered and the input voltage is 210V-219V, the novel UPS bypass voltage regulating device automatically regulates to a small step-up gear, as shown in FIG. 3, the linkage regulating switch 14 acts to a middle position, the linkage regulating switch 14 regulates the winding of the step-down transformer 2 to the middle position through the regulating part 16, the winding of the step-up transformer 1 is regulated to the middle position, the winding length of the winding access device end of the step-up transformer 1 is longer than that of the winding access device end of the step-down transformer 2, so that the step-up variation of the step-up transformer 1 is larger than the step-down variation of the step-down transformer 2,
example 3:
when the device detects that the input voltage of the AC uninterrupted power supply device is increased and the input voltage is 220V-230V, the novel UPS bypass voltage regulating device automatically regulates to downshift, as shown in figure 4, the linkage regulating switch 14 acts, the linkage regulating switch 14 regulates the winding of the step-down transformer 2 to the lowest position through the regulating part 16, the winding of the step-up transformer 1 to the highest position is regulated, meanwhile, the second silicon controlled rectifier 6, the third silicon controlled rectifier 7 and the fourth silicon controlled rectifier 8 are closed, the first silicon controlled rectifier 5 is disconnected, so that the step-up transformer 1 does not act, the step-down transformer 2 acts, and the AC uninterrupted power supply device can stably increase the power supply voltage by 220V and convey the power supply voltage to a load through the bypass voltage regulating device for normal work of the load.
Example 4:
when the device detects that the input voltage of the alternating current uninterrupted power supply device reaches a stable voltage value and the input voltage is 220V, the novel UPS bypass voltage regulating device automatically regulates to a direct gear, as shown in figure 5, the linkage regulating switch 14 acts, the linkage regulating switch 14 regulates the windings of the step-up transformer 1 and the step-down transformer 2 to the highest position through the regulating part 16, and meanwhile, the first silicon controlled rectifier 5, the second silicon controlled rectifier 6, the third silicon controlled rectifier 7 and the fourth silicon controlled rectifier 8 are closed, so that the step-up transformer 1 and the step-down transformer 2 do not act, the step-up transformer 1 acts, and the alternating current uninterrupted power supply device directly provides 220V stabilized voltage for a load.
The fifth controllable silicon 9 is used for protecting and measuring voltage functions and is equivalent to open circuit, when the device works, the fifth controllable silicon 9 is closed, the measured voltage and the current measured by ct are monitored after the fifth controllable silicon 9 is closed, and once the preset unsafe value is exceeded, the device stops voltage regulation work.
The novel UPS bypass voltage regulating device automatically regulates the working mode according to the change of the input voltage, stabilizes the output voltage within an allowable range, does not need manual operation and does not need a manual voltage regulating loop.
The device comprises an MCU control circuit, an overvoltage and undervoltage detection device, a frequency abnormality detection device and a machine fault detection alarm device which are arranged on an automatic protection device 4.
In the utility model, the MCU control circuit is used for realizing the voltage regulation control function and is responsible for switching and allocating the control device.
In the utility model, the overvoltage and undervoltage detection device is used for detecting the voltage and judging whether the voltage meets the conveying requirement so as to carry out adjustment.
In the utility model, the frequency abnormality detection device is used for detecting whether the voltage frequency is normal or not and is responsible for detecting whether the working state of the device has abnormal change or not.
The machine fault detection alarm device is used for alarming in sound, light, communication and other modes after the fault of the machine and the device is found, and is responsible for detecting the running state of the device and sending an alarm signal when the device has the fault.
The utility model improves the accuracy and the safety of the bypass voltage regulating device for regulating the AC uninterrupted power supply by the detection interconnection of all the protection devices, and ensures that the bypass voltage regulating device and the AC uninterrupted power supply device can meet the requirement of long-term continuous voltage transmission and power supply.
The novel UPS bypass voltage regulating device is connected with a display and communication device, the display device is used for displaying information such as equipment sampling, setting, alarming and the like, and the communication device is used for realizing an external communication function. An operator can rapidly and intuitively place the working state of an alternating current Uninterruptible Power Supply (UPS) and the running of a bypass voltage regulating device in which gear through a display device, timely acquire the position and reason of the fault of the device, combine a communication device to rapidly carry out corresponding processing operation, ensure the normal voltage regulation and stabilization of the device, and keep the load to work normally.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. A novel UPS bypass voltage regulating device is characterized by comprising a step-up transformer, a step-down transformer, an isolation transformer, a bypass switch, an automatic protection device, a silicon controlled rectifier regulating device, a measurement checking device and a linkage regulating switch, wherein the step-down transformer is arranged at the input end of the device, the step-up transformer is arranged at the output end of the device, the winding regulating end of the step-down transformer and the winding regulating end of the step-up transformer are connected with the regulating part of the linkage regulating switch, the silicon controlled rectifier regulating device comprises a first silicon controlled rectifier, a second silicon controlled rectifier, a third silicon controlled rectifier, a fourth silicon controlled rectifier and a fifth silicon controlled rectifier, the first silicon controlled rectifier, the second silicon controlled rectifier and the third silicon controlled rectifier are connected in series with the fourth silicon controlled rectifier, the first silicon controlled rectifier and the winding regulating end of the step-down transformer are connected in parallel, and the third silicon controlled rectifier and the winding regulating end of the step-up transformer are connected in parallel, the fifth controllable silicon is connected in series with a channel formed by the first controllable silicon, the second controllable silicon, the third controllable silicon and the fourth controllable silicon, the measurement and inspection device comprises a protection measurement and inspection part, a first winding measurement and inspection part and a second winding measurement and inspection part, the protection measurement inspection part is serially connected with the front end of the fifth silicon controlled rectifier, the fifth silicon controlled rectifier and the protection measurement inspection part are connected with a zero line of the device, the first winding measurement and inspection part is connected with the first controllable silicon in parallel, the second winding measurement and inspection part is connected with the third controllable silicon in parallel, the automatic protection device is arranged between the fifth controllable silicon and the protection measurement inspection part, the bypass switch is arranged between the input live wire and the output live wire, the bypass switch is connected with the output end of the bypass voltage regulating device, the isolation transformer is arranged and connected between the winding of the step-down transformer and the winding of the step-up transformer.
2. The novel UPS bypass voltage regulation device of claim 1, wherein the automatic protection device comprises an MCU control circuit, an overvoltage and undervoltage detection device, a frequency abnormality detection device and a machine fault detection alarm device.
3. The novel UPS bypass voltage regulation device according to claim 1, wherein a current transformer is arranged at the output end of the bypass voltage regulation device, and the current transformer is arranged between the rear end of the step-up transformer and the linkage regulation switch.
4. The novel UPS bypass voltage regulation device of claim 1 wherein the bypass switch comprises a voltage regulation off gear and an automatic voltage regulation gear.
5. The novel UPS bypass voltage regulator of claim 1, wherein the input terminal is provided with a power input control switch.
6. The novel UPS bypass voltage regulation device of claim 1, wherein the novel UPS bypass voltage regulation device is connected with a display and communication device.
7. The novel UPS bypass voltage regulation device of claim 1, wherein the novel UPS bypass voltage regulation device comprises four voltage regulation gears, and the voltage regulation gears comprise a large boost gear, a small boost gear, a buck gear and a through gear.
8. The novel UPS bypass voltage regulator of claim 7, wherein the winding length of the winding access device end of the step-up transformer is longer than the winding length of the winding access device end of the step-down transformer in the small step-up gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122009821.XU CN216312989U (en) | 2021-08-24 | 2021-08-24 | Novel UPS bypass pressure regulating device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122009821.XU CN216312989U (en) | 2021-08-24 | 2021-08-24 | Novel UPS bypass pressure regulating device |
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| CN216312989U true CN216312989U (en) | 2022-04-15 |
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| CN202122009821.XU Active CN216312989U (en) | 2021-08-24 | 2021-08-24 | Novel UPS bypass pressure regulating device |
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